We hereby present a successful case study at E WWTP, Spain.   E WWTP was originally constructed in 1999 and the expansion and upgrade were needed. There were 3 objectives: 1. To design a facility capable of producing reclaimed water of the highest quality (class A Quality 1085/2024); 2. Increase the treatment capacity of the WWTP (up to18,000 m³/d from original 12,000 m³/d); 3. Improve the conventional treatment of the WWTP. Kubota supplied membrane units to be incorporated in the aeration tank without any separation between the fine bubble diffusers (combined MBR design) and supported energy efficient siphon filtration system with no backwash. As a result, both line A (MBR + lower dosage UV) and line B (upgraded CAS + UV) permeate quality achieved class A water quality with E.Coli removal rate over log 5 with both lines under stable operation. This case is not just a success story in water scarce South Spain but it could be a roadmap for many wastewater treatment plants that need to adapt to a world with less water, safe and stable water reclamation technology and operation.